CN210429686U - Contact system and direct current contactor comprising same - Google Patents
Contact system and direct current contactor comprising same Download PDFInfo
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- CN210429686U CN210429686U CN201921199465.9U CN201921199465U CN210429686U CN 210429686 U CN210429686 U CN 210429686U CN 201921199465 U CN201921199465 U CN 201921199465U CN 210429686 U CN210429686 U CN 210429686U
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Abstract
A contact system and a direct current contactor comprising the contact system are provided, the contact system comprises a first fixed contact and a second fixed contact which are arranged in a shell of the direct current contactor, and a movable contact movably arranged in the shell and provided with a first end part and a second end part which can be respectively contacted with or separated from the first fixed contact and the second fixed contact, wherein the first fixed contact is electrically connected with an inlet terminal system of the direct current contactor, the second fixed contact is electrically connected with an outlet terminal system of the direct current contactor, the contact system also comprises a first permanent magnet component and a second permanent magnet component, wherein the first permanent magnet assembly is positioned near the first ends of the first fixed contact and the moving contact, the second permanent magnet assembly is positioned near the second ends of the second fixed contact and the moving contact, so that the first magnetic field intensity generated by the first permanent magnet assembly at the first fixed contact is smaller than the second magnetic field intensity generated by the second permanent magnet assembly at the second fixed contact.
Description
Technical Field
The present invention relates to a contact system and to a dc contactor comprising such a contact system.
Background
A dc contactor is a contactor used in a dc circuit, and is mainly used to control a dc circuit such as a main circuit, a control circuit, an excitation circuit, and the like.
With the rapid development of rail transit, the demand of a rail transit system for a direct current contactor is increasing. Therefore, the direct current contactor has the requirements of high voltage, large current, small volume and low cost.
In addition, when a moving contact in the direct current contactor is separated from a fixed contact, the fixed contact and the moving contact are corroded to different degrees due to the short arc at the anode and the long arc at the cathode, so that the service life of the contactor is greatly shortened. Therefore, how to improve the service life of the contactor under high voltage and large current is also an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims at providing a contact system and contain direct current contactor of this contact system for can improve the life of contactor under the condition that does not use the arc-extinguishing piece, reduce the volume of contactor, reduce the cost of contactor.
The utility model relates to a contact system of a direct current contactor, which comprises a first static contact and a second static contact which are arranged in a shell of the direct current contactor, and a movable contact movably arranged in the shell and provided with a first end part and a second end part which can be respectively contacted with or separated from the first fixed contact and the second fixed contact, wherein the first fixed contact is electrically connected with an inlet terminal system of the direct current contactor, the second fixed contact is electrically connected with an outlet terminal system of the direct current contactor, the contact system also comprises a first permanent magnet component and a second permanent magnet component, wherein the first permanent magnet assembly is positioned near the first ends of the first fixed contact and the moving contact, the second permanent magnet assembly is positioned near the second ends of the second fixed contact and the moving contact, so that the first magnetic field intensity generated by the first permanent magnet assembly at the first fixed contact is smaller than the second magnetic field intensity generated by the second permanent magnet assembly at the second fixed contact.
In one embodiment, the first magnetic field strength and the second magnetic field strength range from 10mT to 50 mT.
In one embodiment, the second magnetic field strength is 30% to 70% greater than the first magnetic field strength.
In one embodiment, the first permanent magnet assembly includes a first fixed contact permanent magnet and a first movable contact permanent magnet, and the second permanent magnet assembly includes a second fixed contact permanent magnet and a second movable contact permanent magnet, where the first fixed contact permanent magnet is located on a side of the first fixed contact away from the center line, the second fixed contact permanent magnet is located on a side of the second fixed contact away from the center line, and the center line is located in the middle of and perpendicular to a connection line between the first fixed contact and the second fixed contact, where the first movable contact permanent magnet is located on a side of the first end of the movable contact away from the first fixed contact, and the second movable contact permanent magnet is located on a side of the second end of the movable contact away from the.
In one embodiment, the contact system further includes a first spacer spatially separating the first permanent magnet assembly from the first stationary and movable contacts, and a second spacer spatially separating the second permanent magnet assembly from the second stationary and movable contacts.
In one embodiment, a first spacer is disposed adjacent to and encapsulates the first permanent magnet assembly between the first spacer and the housing of the dc contactor, and a second spacer is disposed adjacent to and encapsulates the second permanent magnet assembly between the second spacer and the housing of the dc contactor.
In one embodiment, the first and second spacers are made of ceramic.
In one embodiment, the number of the first fixed contact permanent magnets is the same as that of the second fixed contact permanent magnets, and the number of the first moving contact permanent magnets is different from that of the second moving contact permanent magnets.
In one embodiment, the number of the first fixed contact permanent magnets is different from the number of the second fixed contact permanent magnets, and the number of the first moving contact permanent magnets is different from the number of the second moving contact permanent magnets.
In one embodiment, the number of the first fixed contact permanent magnets and the number of the second fixed contact permanent magnets are both at least one, the number of the first moving contact permanent magnets is at least one, and the number of the second moving contact permanent magnets is at least three.
The utility model discloses still relate to a direct current contactor, it includes the casing, direct current contactor still includes and arranges two at least poles inside the casing in proper order on the first direction, and each in two at least poles includes inlet wire end system, the end system of being qualified for the next round of competitions and as before the contact system.
In one embodiment, the direct current contactor comprises a first pole and a second pole, and the incoming line end system, the contact system and the outgoing line end system in the first pole are sequentially arranged in a second direction perpendicular to the first direction; the inlet end system, the contact system and the outlet end system in the second pole are arranged in sequence in a direction opposite to the second direction.
Drawings
The advantages and objects of the present invention will be better understood from the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the relationship of the various components. In the drawings:
fig. 1 shows a schematic cross-sectional view of a contact system of a dc contactor according to an embodiment of the present invention; and
fig. 2 is a schematic diagram of a dc contactor according to an embodiment of the present invention.
Detailed Description
Various embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Here, it is to be noted that, in the drawings, the same reference numerals are given to constituent parts having substantially the same or similar structures and functions, and repeated description thereof will be omitted. The terms "first direction", "second direction", etc. herein are described with respect to the drawings of the present invention, unless otherwise specified. The term "sequentially comprising A, B, C etc" does not exclude the possibility of including other components between a and B and/or between B and C. The description of "first" and its variants is merely for the purpose of distinguishing between the parts and does not limit the scope of the invention, which can be written as "second" and so on without departing from the scope of the invention.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of the respective portions and the mutual relationships thereof.
Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to fig. 1 to 2.
As shown in fig. 1, a contact system 100 for a dc contactor includes a first stationary contact 1 and a second stationary contact 2 disposed in a housing of the dc contactor, and a movable contact 3 movably disposed in the housing. The movable contact 3 has a first end 4 and a second end 5, which can be respectively contacted with or separated from the first stationary contact 1 and the second stationary contact 2 under the action of a driving mechanism of the dc contactor, so as to switch on or off the dc contactor.
The first static contact 1 is electrically connected with an inlet end system of the direct current contactor, and the second static contact 2 is electrically connected with an outlet end system of the direct current contactor. When the moving contact is contacted with the fixed contact, the direct current contactor is switched on. When the moving contact is separated from the stationary contact, generally, due to the difference in the moving speed of the arc root of the arc at the anode and the cathode, a longer arc is formed at the first stationary contact 1 and the first end portion 4, and a shorter arc is formed at the second stationary contact 2 and the second end portion 5. So will cause the first end department of first static contact and moving contact and the second end department different degree's of second static contact and moving contact to burn to shorten direct current contactor's life.
In order to improve the service life of the contactor, the contact system of the present invention further comprises a first permanent magnet assembly 6 and a second permanent magnet assembly 7. As shown in fig. 1, the first permanent magnet assembly 6 is located near the first end 4 of the first fixed contact 1 and the first end 4 of the movable contact 3, and the second permanent magnet assembly 7 is located near the second end 5 of the second fixed contact 2 and the second end 5 of the movable contact 3, so that a first magnetic field strength generated by the first permanent magnet assembly 6 at the first fixed contact 1 is smaller than a second magnetic field strength generated by the second permanent magnet assembly 7 at the second fixed contact 2. That is, in the operating position of the contact (i.e., the position at which the first end portion and the second end portion of the movable contact are in contact with the first stationary contact and the second stationary contact, respectively), the first magnetic field strength is smaller than the second magnetic field strength.
For example, the first magnetic field strength and the second magnetic field strength both range from 10mT to 50 mT. Preferably, the first magnetic field strength is about 19mT and the second magnetic field strength is about 30 mT.
For example, the second magnetic field strength is 30% to 70% greater than the first magnetic field strength. Preferably, the second magnetic field strength is 35% greater than the first magnetic field strength.
For example, the first permanent magnet assembly 6 includes a first fixed contact permanent magnet 8 and a first movable contact permanent magnet 9, and the second permanent magnet assembly 7 includes a second fixed contact permanent magnet 10 and a second movable contact permanent magnet 11.
As shown in fig. 1, the first stationary contact permanent magnet 8 is located on one side of the first stationary contact 1 away from the center line, and the second stationary contact permanent magnet 10 is located on one side of the second stationary contact 2 away from the center line. The centre line is located between and perpendicular to a line connecting the first stationary contact and the second stationary contact, which is not shown in fig. 1 for simplicity. In fig. 1, a first stationary contact permanent magnet 8 is located on the left side of a first stationary contact 1 and is spaced from the first stationary contact 1 by a distance, a second stationary contact permanent magnet 10 is located on the right side of a second stationary contact 2 and is spaced from the second stationary contact 2 by a distance, and the first stationary contact permanent magnet 8 and the second stationary contact permanent magnet 10 are symmetrically arranged about a center line.
As shown in fig. 1, the first moving contact permanent magnet 9 is located on a side of the first end portion 4 of the moving contact 3 away from the first fixed contact 1, and the second moving contact permanent magnet 11 is located on a side of the second end portion 5 of the moving contact 3 away from the second fixed contact 2. In fig. 1, the first moving contact permanent magnet 9 is located above the first end portion 4, and the second moving contact permanent magnet 11 is located above the second end portion 5.
A first magnetic field intensity generated by the first fixed contact permanent magnet 8 and the first moving contact permanent magnet 9 at the first fixed contact 2 is smaller than a second magnetic field intensity generated by the second fixed contact permanent magnet 10 and the second moving contact permanent magnet 11 at the second fixed contact 2.
For example, the number of the first stationary permanent magnets 8 is the same as that of the second stationary permanent magnets 10, for example, one. The utility model discloses well static contact permanent magnet's quantity is not limited to this, still can be two, three etc..
For example, the number of the first moving contact permanent magnets 9 is different from that of the second moving contact permanent magnets 11. For example, the number of the first moving contact permanent magnets 9 is one, and the number of the second moving contact permanent magnets 11 is three. The utility model discloses well first moving contact permanent magnet's quantity still can be for two, three, four etc.. The utility model discloses well second moving contact permanent magnet's quantity still can be for four, five, six etc..
For example, the number of the first fixed contact permanent magnets 8 and the number of the second fixed contact permanent magnets 10 may be different, and the number of the first movable contact permanent magnets 9 and the number of the second movable contact permanent magnets 11 may be different.
Because above-mentioned different magnetic field intensity, the utility model discloses an electric arc that the positive pole department of contact system received magnetic field is less than the effect of lengthening that negative pole department electric arc received magnetic field for electric arc length at positive pole and negative pole department is similar the same, thereby reduces the scaling loss to the contact, has prolonged contact system's life. Additionally, the utility model discloses a contact system does not use the arc-extinguishing plate who occupies great space, therefore the volume is less, compact structure.
As shown in fig. 1, the contact system further comprises a first spacer 12 for spatially separating the first permanent magnet assembly 6 from the first stationary contact 1 and the movable contact 3, and a second spacer 13 for spatially separating the second permanent magnet assembly 7 from the second stationary contact 2 and the movable contact 3. For example, the first and second spacers are made of ceramic, such as ceramic sheets. A first spacer 12 is shown arranged adjacent to the first permanent magnet assembly 6 and enclosed between the first spacer and the housing of the contactor, and a second spacer 13 is shown arranged adjacent to the second permanent magnet assembly 7 and enclosed between the second spacer and the housing of the contactor. Alternatively, the first and second spacers 12 and 13 are ceramic films attached to the first and second permanent magnet assemblies 6 and 7, respectively.
The utility model discloses an use ceramic isolator, not only can protect the magnetism of permanent magnet subassembly to avoid the influence of electric arc, can protect the lateral wall of casing moreover to avoid the electric arc scaling loss.
Fig. 2 shows an embodiment of the dc contactor of the present invention. As shown in fig. 2, the dc contactor 200 includes a housing 203, and a first pole 201 and a second pole 202 arranged inside the housing in this order in a first direction (direction x from left to right in the drawing). Each of the first and second poles includes an in-line end system, an out-line end system, and the contact system 100 described above.
The utility model discloses a direct current contactor can also be including being more than two utmost points.
When connecting the above-mentioned direct current contactor into an electric circuit, the contact system in the first pole is connected in series with the contact system in the second pole.
For example, in a second direction (direction y pointing from top to bottom in the figure) perpendicular to the first direction, the first pole 201 includes a first incoming end system 2011, a first contact system 2012 and a first outgoing end system 2013, which are arranged in sequence. In a direction opposite to the second direction (the-y direction pointing up from bottom in the figure), the second pole 202 includes a second incoming end system 2021, a second contact system 2022, and a second outgoing end system 2023, which are arranged in this order.
In the first contact system 2012, a first magnetic field intensity generated by the first permanent magnet assembly at the first fixed contact electrically connected to the first incoming line end system 2011 is smaller than a second magnetic field intensity generated by the second permanent magnet assembly at the second fixed contact electrically connected to the first outgoing line end system 2013, where the number of the first moving contact permanent magnets near the first incoming line end system 2011 is one, and the number of the second moving contact permanent magnets near the first outgoing line end system 2013 is three.
In the second contact system 2022, a first magnetic field strength generated by the first permanent magnet assembly at the first fixed contact electrically connected to the second wire-inlet end system 2021 is less than a second magnetic field strength generated by the second permanent magnet assembly at the second fixed contact electrically connected to the second wire-outlet end system 2023, as shown in the figure, the number of the first moving contact permanent magnets near the second wire-inlet end system 2021 is one, and the number of the second moving contact permanent magnets near the second wire-outlet end system 2023 is three.
The number of the moving contact permanent magnets in the two poles shown in the upper diagram is only exemplary, and the number of the permanent magnets near the outlet end system in the first pole may be different from the number of the permanent magnets near the outlet end system in the second pole according to actual needs.
The first pole and the second pole are shown in fig. 2 as being spaced apart by a distance, but the present invention is not limited thereto and the first pole and the second pole may also be disposed in the housing next to each other. Therefore, the utility model discloses a dipolar direct current contactor can assemble in the mechanical structure of conventional contactor in a flexible way to reduction in production cost. Furthermore, the utility model discloses a direct current contactor life is longer and the volume is less.
The technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention to achieve the aim of the invention.
Claims (12)
1. A contact system of a direct current contactor comprises a first fixed contact and a second fixed contact which are arranged in a shell of the direct current contactor, and a movable contact which is movably arranged in the shell and is provided with a first end part and a second end part which can be respectively contacted with or separated from the first fixed contact and the second fixed contact, and is characterized in that,
the first stationary contact is electrically connected with the inlet terminal system of the DC contactor, the second stationary contact is electrically connected with the outlet terminal system of the DC contactor, an
The contact system further comprises a first permanent magnet assembly and a second permanent magnet assembly, wherein the first permanent magnet assembly is located near the first end portions of the first fixed contact and the moving contact, and the second permanent magnet assembly is located near the second end portions of the second fixed contact and the moving contact, so that a first magnetic field strength generated by the first permanent magnet assembly at the first fixed contact is smaller than a second magnetic field strength generated by the second permanent magnet assembly at the second fixed contact.
2. The contact system of claim 1, wherein the first magnetic field strength and the second magnetic field strength range from 10mT to 50 mT.
3. The contact system of claim 1, wherein the second magnetic field strength is 30% to 70% greater than the first magnetic field strength.
4. The contact system of claim 1, wherein the first permanent magnet assembly comprises a first stationary contact permanent magnet and a first movable contact permanent magnet, the second permanent magnet assembly comprises a second stationary contact permanent magnet and a second movable contact permanent magnet,
wherein the first static contact permanent magnet is positioned at one side of the first static contact far away from the center line, the second static contact permanent magnet is positioned at one side of the second static contact far away from the center line, the center line is positioned between and vertical to the connecting line of the first static contact and the second static contact,
the first moving contact permanent magnet is positioned on one side, away from the first fixed contact, of the first end part of the moving contact, and the second moving contact permanent magnet is positioned on one side, away from the second fixed contact, of the second end part of the moving contact.
5. The contact system of claim 1, further comprising a first spacer spatially separating the first permanent magnet assembly from the first stationary contact and the movable contact, and a second spacer spatially separating the second permanent magnet assembly from the second stationary contact and the movable contact.
6. The contact system of claim 5, wherein a first spacer is disposed adjacent to and encapsulates the first permanent magnet assembly between the first spacer and the housing of the DC contactor, and a second spacer is disposed adjacent to and encapsulates the second permanent magnet assembly between the second spacer and the housing of the DC contactor.
7. The contact system of claim 6, wherein the first and second spacers are made of ceramic.
8. The contact system of claim 4, wherein the number of first stationary contact permanent magnets is the same as the number of second stationary contact permanent magnets, and wherein the number of first movable contact permanent magnets is different from the number of second movable contact permanent magnets.
9. The contact system of claim 4, wherein the number of first stationary contact permanent magnets is different from the number of second stationary contact permanent magnets, and wherein the number of first movable contact permanent magnets is different from the number of second movable contact permanent magnets.
10. The contact system of claim 8, wherein the number of the first stationary contact permanent magnets and the number of the second stationary contact permanent magnets are each at least one, the number of the first movable contact permanent magnets is at least one, and the number of the second movable contact permanent magnets is at least three.
11. A dc contactor comprising a housing, characterized in that the dc contactor further comprises at least two poles arranged in sequence inside the housing in a first direction, each of the at least two poles comprising an incoming line end system, an outgoing line end system and a contact system according to any of the preceding claims 1 to 10.
12. The dc contactor as recited in claim 11, wherein the dc contactor comprises a first pole and a second pole, the incoming line terminal system, the contact terminal system, and the outgoing line terminal system in the first pole being arranged in sequence in a second direction perpendicular to the first direction; the inlet end system, the contact system and the outlet end system in the second pole are arranged in sequence in a direction opposite to the second direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921199465.9U CN210429686U (en) | 2019-07-26 | 2019-07-26 | Contact system and direct current contactor comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921199465.9U CN210429686U (en) | 2019-07-26 | 2019-07-26 | Contact system and direct current contactor comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210429686U true CN210429686U (en) | 2020-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921199465.9U Active CN210429686U (en) | 2019-07-26 | 2019-07-26 | Contact system and direct current contactor comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210429686U (en) |
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- 2019-07-26 CN CN201921199465.9U patent/CN210429686U/en active Active
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